The inner circumferenc

Question

The inner circumference of a circular race track. 14 m. wide, is 440 m. Find the radius of the outer circle .

Options:

A . 80 m

B . 82 m

C . 84 m

D . 85 m

Answer: Option C

Let inner radius be r meres, Then , `2 pi `r = 440

`rArr r = (440 xx 7/44) = 70 m`

`:.` Radius of outer circle = (70 + 14)m = 84 m.

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